A 3.0 T MRI magnet using MgB₂ superconductors with conduction cooling for dedicated mice imaging was designed. The magnet configuration is determined by the central magnetic field strength, maximum magnetic field, magnetic field uniformity, uniformity volume, stray field, and coil costs. Linear programming was used to optimize the superconducting magnet of the MRI system. The optimized superconducting magnet can generate a central field of 3.0 T with field homogeneity better than 10 ppm in a 50 mm diameter of spherical volume (DSV). Actively shielded coils with opposite current densities were adopted to reduce the stray field. Finite element methods were used to analyze the mechanical stress and strain in the MgB₂ coils during winding, cool-down from room temperature and electromagnetic excitation. The analysis results showed that the strain on the coils is within the design criteria. In this paper, the coil optimization design, electromagnetic and stress analysis were given.

设计了一种3.0 M MRI磁体，该磁体使用MgB ₂超导体和传导冷却技术进行专用小鼠成像。磁体的配置取决于中心磁场强度，最大磁场，磁场均匀性，均匀性体积，杂散场和线圈成本。线性编程用于优化MRI系统的超导磁体。经过优化的超导磁体可以在直径为50毫米的球形体积（DSV）中产生3.0 T的中心磁场，其磁场均匀性优于10 ppm。采用具有相反电流密度的有源屏蔽线圈来减小杂散场。使用有限元方法分析MgB _2中的机械应力和应变线圈在缠绕过程中，从室温冷却和电磁激励。分析结果表明，线圈上的应变在设计标准之内。本文给出了线圈的优化设计，电磁和应力分析。